i'm having problems with my ions as well. my drum pads seem to have ring-like zones on them where they either will or won't register hits.
the center will register a hit, but then there's a dead zone just outside of center, maybe about 1/3 thru the pad. outside of that is a ring that will register hits, but then the last inch or so at the edge of the pad is also dead again.
this is happening on my red and yellow pads for sure, not positive about the green/blue (i mostly notice it on the red one and did most of my testing there).
i tried swapping some cables around but that didn't change anything.
has anyone else had this? does this sound like a brain problem?
any help or suggestions would be great! i've stopped playing as much as i used to because missing all the notes that i am since switching to my ion's is killing me. all in all i like the size and setup of the ion's, but missing these notes is no fun.